US4508547A - Electrostatic precipitator having a sealing cover or roof - Google Patents

Electrostatic precipitator having a sealing cover or roof Download PDF

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Publication number
US4508547A
US4508547A US06/500,295 US50029583A US4508547A US 4508547 A US4508547 A US 4508547A US 50029583 A US50029583 A US 50029583A US 4508547 A US4508547 A US 4508547A
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United States
Prior art keywords
sheets
clips
electrostatic precipitator
interstices
flange
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Expired - Fee Related
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US06/500,295
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English (en)
Inventor
Josef J. Seufert
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GEA Group AG
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Metallgesellschaft AG
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Publication date
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Assigned to METALLGESELLSCHAFT AKTIENGESELLSCHAFT reassignment METALLGESELLSCHAFT AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SEUFERT, JOSEF J.
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/82—Housings

Definitions

  • My present invention relates to a sealing cover or roof structure for an electrostatic precipitator and, more particularly, to improvements in the attachment of a ceiling structure above the gas flow compartments of an electrofilter, i.e. an electrostatic precipitator in which dust is removed from a gas stream.
  • An electrostatic precipitator generally comprises a housing structure provided with a gas inlet and a gas outlet, a multiplicity of dust-collecting plates suspended in this housing for collecting particles of dust from the gas on these plates, means for dislodging the dust from the plates and for collecting the dislodged particles, and corona discharge electrodes which charge the dust particles to a polarity opposite that which is applied by a high-voltage source across the electrodes to the collecting plates.
  • Electrostatic precipitators may have sealing covers or roof structures, i.e. so called ceilings which can be composed of sheet metal (see inter alia commonly assigned U.S. Pat. No. 4,248,610 and the references therein cited).
  • Such sheet metal members can rest above support beams extending horizontally across the top of the housing and from which the collecting plates may be suspended.
  • Metal strips can overlie the seams or edges of these metal sheets and can be welded to them to form a gas tight seal whereby the roof structure can be described as a sealing roof.
  • sealing roof structures of this type are generally satisfactory because of their structural simplicity, ease of installation and economy. However, they are not capable of withstanding even brief pressure rises which have come to be expected in the operation of such electrostatic precipitators with combustible gases.
  • gases which may contain combustible components.
  • gases can be standard flue gases from combustion chambers, e.g. boiler combustion chambers, metallurgical plants, chemical plants or the like, and even for product gases or byproduct gases, e.g. of metallurgical plants, which can contain combustible components.
  • the beams on which the sheet metal elements rest are so-called I beams, i.e. generally have upper and lower flanges interconnected by vertical webs and with these beams are capable of withstanding considerable force since they function as structural supports for the collecting electrodes and to provide a supporting surface for the roof sheets which can be overlapped by them.
  • the beams generally extend in the direction of gas flow, and have the same spacing as the arrays of collecting electrodes.
  • Another object of this invention is to provide a system for connecting the roof sheets to the joists or beams which is simple and economical, which permits the assembly of the roof structure in a rapid manner, and which can withstand pressure surges up to at least 100 mbar above atmospheric pressure.
  • Still another object of this invention is to provide an improved method of attaching the roofing sheets whereby welding to the carriers (beams or joists) or the drilling thereof to form holes for screws can be avoided, not only because of the additional costs of such operations, but because of the weakening of the support members that such operations would entail.
  • Still another object of the invention is to provide a roof structure for an electrofilter of the class described which facilitates inspection, disassembly and repair.
  • an electrostatic precipitator of the kind in which a plurality of transversely spaced longitudinal extending I beams are provided as carriers for the roof structure and the roof structure comprises a multiplicity of comparatively thin sheet metal plates disposed on these carriers, extending transversely thereof and separated by small gaps or interstices.
  • each bar of such sheets defining respective interstices is held onto a respective beam by a clip having a generally "C" shape and formed with a head projecting laterally from its body to either side thereof and overlying juxtaposed but spaced edges of the two sheets and the underlying flange of the carrier which is overhung by the head.
  • the body of the clip extends between these juxtaposed edges through the interstices and reaches below the flange of the carrier to engage the underside of this flange over which the clip is forced with slight spreading of the clip so that intrinsic resilience of the metallic clip locks the two sheets of the carrier.
  • Such clips can be provided at each carrier or joist for each pair of spaced juxtaposed edges and when the interstices are then covered by strips which are welded to the metal sheets, the entire assembly is fully sealed and the frictional attachment of the sheets via the clips to the flanges can resist substantial pressure surges within the electrostatic precipitator.
  • the head of the clip is formed by welding a bar to the upper arm of the clip and the clips are held in place in part by spot-welding or tack-welding them to the respective sheets at the respective ends of the bar which overhang these sheets.
  • FIG. 1 is a plan view of a roof structure according to the invention prior to the application of the sealing strips diagrammatically showing some of the clips holding a pair of roof sheets on the upper flanges of a group of joists;
  • FIG. 2 is a vertical sectional view through the roof structure of FIG. 1 taken along the line II--II of FIG. 1;
  • FIG. 3 is a cross sectional view taken along the line III--III of FIG. 4 and showing in some detail the clip and its relationship to one of the sheets;
  • FIG. 4 is a cross sectional view corresponding to FIG. 2 but drawn to an enlarged scale and representing a detail view of a joist;
  • FIG. 5 is a plan view of this region of the joint prior to application of the sealing strip.
  • the invention can be applied to a dry-process electrostatic precipitator having a horizontal gas flow path through, a plurality of dust-collecting fields which follow one another in the direction of gas flow.
  • the invention is also applicable to any other elctrostatic precipitator structure which should have a sealing roof assembly and which should be capable of providing the assembly from sheet metal plates or sheets above carriers or joists in the form of flanged members so that these sheets lie on the flanges.
  • collecting electrodes can be suspended from beams or carriers 5 also referred to as joists, which extend parallel to the direction of gas flow represented by the arrow A and are supported on angle irons 20 from box-section roof beams shown at 8.
  • the beams 5 are spaced apart essentially by the width of the gas flow passages defined by parallel arrays of the collector electrodes 9.
  • the beams 5 also serve as supports for the metal sheets 1 making up the ceiling structure and these sheet metal elements are initially spaced apart to define interstices 2 through which portions of the underlying beams are visible (see FIG. 1) and these interstices can then be closed by metal strips 10 and 11 which can be angled or planar and which are seam-welded to the roof beams 8 and to the sheets 1 or just to the sheets 1 over the interstices as illustrated to seal the interstices.
  • each pair of sheets is held down against each beam 5 by a clip 3 passing through the interstices.
  • the clip construction has been shown in greater detail in FIGS. 3-5.
  • each clip 3 comprises a "C" shaped or "U” shaped metal body 6 which can be bent from a rectangular cross section metal bar, and has an upper arm 6a, a lower arm 6b and a bight 6c connecting these arms which are designed to straddle the flange 4 of the I beam and which can be braced against the underside of the flange.
  • a bevel 6d can be provided to allow the clip to be fitted in the direction of arrow B over the flange and hammered into place, thereby tending to spread the arm 6a and 6b, slightly so that the clamping force is the intrinsic resilience or contractile force thus developed in the clip.
  • a transverse bar 7 is welded to the upper arm 6a to form the head of the clip and as can be seen from FIG. 5, overlies juxtaposed but spaced apart edges of two sheets 1 where these, in turn, rest upon the underlying beam 5.
  • Tack-welds 21 can serve to hold the clip in place and are provided between the bar 7 and the sheets 1 (see FIG. 5) although spot-welds can equally be used.
  • the clips 3 can be installed and removed utilizing only a hammer in a simple manner. They have a shape which prevents them from falling through the interstices especially if the bar 7 is made somewhat wider than the width of the interstices, since it will always be of a length greater than the width of the interstices.

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  • Electrostatic Separation (AREA)
US06/500,295 1982-06-09 1983-06-02 Electrostatic precipitator having a sealing cover or roof Expired - Fee Related US4508547A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3221718A DE3221718C2 (de) 1982-06-09 1982-06-09 Dichtdecke für einen Elektroabscheider
DE3221718 1982-06-09

Publications (1)

Publication Number Publication Date
US4508547A true US4508547A (en) 1985-04-02

Family

ID=6165679

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/500,295 Expired - Fee Related US4508547A (en) 1982-06-09 1983-06-02 Electrostatic precipitator having a sealing cover or roof

Country Status (3)

Country Link
US (1) US4508547A (enrdf_load_stackoverflow)
JP (1) JPS5936556A (enrdf_load_stackoverflow)
DE (1) DE3221718C2 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090235821A1 (en) * 2008-03-24 2009-09-24 Hitachi Plant Technologies, Ltd. Structure for attaching dust collection electrode of wet electric dust collector
US20130284025A1 (en) * 2010-12-29 2013-10-31 Alstom Technology Ltd Electrical screening device for structures near high voltage parts of electrostatic precipitators

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61146297A (ja) * 1984-12-19 1986-07-03 三洋電機株式会社 遠心脱水機
JPS61240996A (ja) * 1985-04-17 1986-10-27 松下電器産業株式会社 洗濯機の洗濯物量検知装置
JPH0728994B2 (ja) * 1985-06-12 1995-04-05 三洋電機株式会社 脱水機
JPH0671509B2 (ja) * 1985-10-11 1994-09-14 株式会社東芝 二槽式洗濯機
JPH0822353B2 (ja) * 1985-11-18 1996-03-06 株式会社東芝 洗濯機用負荷量検出装置
JPS63132697A (ja) * 1986-11-21 1988-06-04 株式会社東芝 洗濯機
JPS63226395A (ja) * 1987-03-14 1988-09-21 株式会社東芝 脱水兼用洗濯機の衣類量検知装置
JP2892749B2 (ja) * 1990-02-28 1999-05-17 株式会社日立製作所 洗濯機の制御方法
CN106311478B (zh) * 2016-11-07 2019-03-19 山东大学 一种快装式中心定位周向对称阳极板组装工艺及装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US673558A (en) * 1900-11-22 1901-05-07 David R Kline Board walk.
US1674210A (en) * 1925-02-13 1928-06-19 Holorib Inc Clamping device
US1683364A (en) * 1924-06-06 1928-09-04 Harry Gillett Clamping device
US3835603A (en) * 1970-04-03 1974-09-17 Fritz Schnebel Means for covering the roof-like areas of supporting structures
US3886676A (en) * 1973-12-28 1975-06-03 Louis Alfonso Sign facing assembly
US4248610A (en) * 1978-08-09 1981-02-03 Metallgesellschaft Aktiengesellschaft Dust collector with pressure-relief opening

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE424082C (de) * 1926-01-16 Siemens Schuckertwerke G M B H Anordnung an elektrischen Gasreinigungskammern
DE1297082B (de) * 1966-01-29 1969-06-12 Metallgesellschaft Ag Elektrostatischer Staubabscheider mit einer als Explosionsklappe zum Schutz der Inneneinrichtung und des Gehaeuses ausgebildeten Abscheiderdecke
AT277399B (de) * 1966-02-02 1969-12-29 Leipzig Inst Ind Stahlbau Gasreinigungsanlage, insbesondere fuer elektrische rauchgasreinigung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US673558A (en) * 1900-11-22 1901-05-07 David R Kline Board walk.
US1683364A (en) * 1924-06-06 1928-09-04 Harry Gillett Clamping device
US1674210A (en) * 1925-02-13 1928-06-19 Holorib Inc Clamping device
US3835603A (en) * 1970-04-03 1974-09-17 Fritz Schnebel Means for covering the roof-like areas of supporting structures
US3886676A (en) * 1973-12-28 1975-06-03 Louis Alfonso Sign facing assembly
US4248610A (en) * 1978-08-09 1981-02-03 Metallgesellschaft Aktiengesellschaft Dust collector with pressure-relief opening

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090235821A1 (en) * 2008-03-24 2009-09-24 Hitachi Plant Technologies, Ltd. Structure for attaching dust collection electrode of wet electric dust collector
US8052782B2 (en) * 2008-03-24 2011-11-08 Hitachi Plant Technologies, Ltd. Structure for attaching dust collection electrode of wet electric dust collector
US20130284025A1 (en) * 2010-12-29 2013-10-31 Alstom Technology Ltd Electrical screening device for structures near high voltage parts of electrostatic precipitators
US8814995B2 (en) * 2010-12-29 2014-08-26 Alstom Technology Ltd Electrical screening device for structures near high voltage parts of electrostatic precipitators
TWI552801B (zh) * 2010-12-29 2016-10-11 通用電器技術有限公司 用於靠近靜電集塵器之高壓部分的結構之電屏蔽裝置

Also Published As

Publication number Publication date
DE3221718C2 (de) 1986-02-13
JPH0243545B2 (enrdf_load_stackoverflow) 1990-09-28
DE3221718A1 (de) 1983-12-15
JPS5936556A (ja) 1984-02-28

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